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(also on hybrid page - apols if incorrect to dup)
Any insight appreciated!
Issue:
Flat 12v ancillary battery - vehicle won't enter ready mode, with VSC/HYBRID warnings. Replaced ancillary battery with new, fully charged, battery.

Vehicle still won't enter ready mode. Seen this before, so hooked up to tech stream, attempt to clear codes (usual C1259/C1310 on the VSC side and raft of Hybrid codes). VSC and Hybrid warnings come back immediately.

I've corrected this before by clearing store, zero point reset and then initialising and calibrating the linear solenoid valve. However, the reset does not work this time ... the ABS light blinks and I can hear the actuator making noises, but the brake control warning light remains on without blinking at all.
I've also tried the same clearing and calibration process using a jumper between TS and CG, but exactly the same result.

In Test mode in Techstream, I can toggle the warning lights on and off, the pedal stroke sensor is in range and functions, and I can toggle the abs related relays on and off. However, I cannot enter test mode to interrogate any of the solenoids or related tests (?!).

I've tested the abs module pinout resistances and everything is in spec. The can bus is not returning any dtcs and all modules appear in the can bus page of tech stream.

Incidentally, I notice that the scss solenoid is "on" from the get-go (no brake pedal press). Is this correct?

Any suggestions most welcome! My first thought is skids ecu has failed... or that maybe the scss solenoid is incorrectly defaulting on and this is causing issues... ugh...